Biocidal Film-Forming Composition and Method for Coating Surfaces With It

Abstract

A biocidal film-forming composition comprising, a nitrogen-containing biocide, a sulphur-containing biocide, an oleophilic carrier, and a film-forming agent. The invention also includes a method of coating an item with that composition. The present invention provides for the manufacture of solid items from plastics materials in which the biocidal composition has been included.

1 . A biocidal film-forming composition comprising a nitrogen-containing biocide, a sulphur-containing biocide, an oleophilic carrier, and a film-forming agent. 
   
   
       2 . A biocidal film-forming composition as claimed in  claim 1  wherein the nitrogen-containing biocide comprises an amide biocide, a triazine, a guanidine, a quaternary ammonium compound, or mixtures or derivatives thereof. 
   
   
       3 . A biocidal film-forming composition as claimed in  claim 1  wherein the nitrogen-containing biocide comprises an optionally substituted linear or branched C 1 -C 20  alkyl ammonium halide or alkylbenzylammonium halide. 
   
   
       4 . A biocidal film-forming composition as claimed in  claim 3  wherein the alkylammonium halide is a dialkyldimethyl ammonium halide or an alkyldimethylbenzyl ammonium chloride. 
   
   
       5 . A biocidal film-forming composition as claimed in  claim 1  wherein the nitrogen-containing biocide is present in the composition in an amount of at least 1 wt % of the total weight of the composition. 
   
   
       6 . A biocidal film-forming composition as claimed in  claim 1  wherein the nitrogen-containing biocide is present in the composition in an amount of no more than 10 wt % of the total weight of the composition. 
   
   
       7 . A biocidal film-forming composition as claimed in  claim 1  wherein the sulphur-containing biocide comprises a thiocarbonate, a thiocyanate, an isothiocyanate, a dithiocarbonate, a thiazole, a thiazolinone, an isothiazolinone, or any mixture or derivative thereof. 
   
   
       8 . A biocidal film-forming composition as claimed in  1  wherein the sulphur-containing biocide comprises methylisothiozolinones and methylhaloisothiazolinones. 
   
   
       9 . A biocidal film-forming composition as claimed in  claim 1  wherein the sulphur-containing biocide is present in an amount of at least 0.001 wt % of the total weight of the composition. 
   
   
       10 . A biocidal film-forming composition as claimed in  claim 1  wherein the sulphur-containing biocide is present in an amount of no more than 0.1 wt % of the total weight of the composition. 
   
   
       11 . A biocidal film-forming composition as claimed in  claim 1  which comprises at least 70 wt % water, based on the total weight of the composition. 
   
   
       12 . A biocidal film-forming composition as claimed in  claim 1  wherein the oleophilic carrier comprises an oleophilic solvent selected from the group consisting of an oleophilic glycol, a C 1 -C 8  linear or branched alkylene glycol and dialkylene glycol. 
   
   
       13 . A biocidal film-forming composition as claimed in  claim 1 , wherein the oleophilic carrier comprises one or more natural or synthetic compounds selected from the group consisting of aromatic aldehydes and ketones, amyl cinn antic aldehyde, plant oils, lavender oil, patchouli oil, peppermint oil, citrus oil, aromatic alcohols, citronellol and xyllols. 
   
   
       14 . A biocidal film-forming composition as claimed in  claim 1 , wherein the oleophilic carrier comprises a mixture of natural oils, scents or fragrances. 
   
   
       15 . A biocidal film-forming composition as claimed in  claim 1  wherein the oleophilic carrier is present in the composition in an amount of at least 1 wt % of the total weight of the composition. 
   
   
       16 . A biocidal film-forming composition as claimed in  claim 1  wherein the oleophilic carrier is present in the composition in an amount of no more than 8 wt % of the total weight of the composition. 
   
   
       17 . A biocidal film-forming composition as claimed in  claim 1  wherein the film-forming agent is a polymeric film-forming agent. 
   
   
       18 . A biocidal film-forming composition as claimed in  claim 17 , wherein the polymeric film-forming agent is a co-polymer of a vinyl ester. 
   
   
       19 . A biocidal film-forming composition as claimed in  claim 1 , wherein a pyrethroid agent is present as, or in addition to, the nitrogen-containing biocide. 
   
   
       20 . A biocidal film-forming composition as claimed in  claim 19 , wherein the pyrethroid agent is present in an amount in the range of 0.01% wt to 6% wt of the total weight of the composition 
   
   
       21 . A biocidal film-forming composition as claimed in  claim 1 , wherein the film-forming agent is present in the composition in an amount of at least 20 wt % of the total weight of the composition. 
   
   
       22 . A biocidal film-forming composition as claimed in  claim 1 , further comprising a solvent. 
   
   
       23 . A biocidal film-forming composition as claimed in  claim 22 , wherein the biocidal composition is an aqueous biocidal composition. 
   
   
       24 . A biocidal film-forming composition as claimed in  claim 23 , wherein the aqueous biocidal composition comprises water in an amount of at least 20 wt % of the total weight of the composition. 
   
   
       25 . A biocidal film-forming composition as claimed in  claim 1 , comprising an organic solvent. 
   
   
       26 . A biocidal film-forming composition as claimed in  claim 25 , wherein the organic solvent is an alkanol. 
   
   
       27 . A method of manufacturing a biocidal surface, the method comprising the step of:
 (a) applying the composition of  claim 1  to a surface.   
   
   
       28 . A method as claimed in  claim 27 , wherein the biocidal composition is a liquid composition comprising one or more solvents and the method comprises after step (a) a step (b) of drying the composition to form a coating. 
   
   
       29  A method as claimed in  claim 27  wherein the surface is a metal surface, wood surface, plastic surface, textile surface, concrete surface, cement surface, glass surface, rubber surface, aggregate, or any of the aforesaid surfaces when coated with a covering. 
   
   
       30 . A method as claimed in  claim 27 , wherein the surface is a door, wall, floor, vehicle surface, surface of an item of furniture, surface of an industrial apparatus or clinical apparatus. 
   
   
       31 . A method as claimed in  claim 27 , wherein the method comprises mixing the composition with a carrier material, the carrier material being arranged to effect adhesion of the composition onto the surface. 
   
   
       32 . A method as claimed in claim  0 , wherein the carrier material is selected from the group consisting of a paint, a lacquer and a glaze. 
   
   
       33 . A method as claimed in claim  0 , wherein the ratio of the biocidal composition to carrier material, is between 1:99 and 12:88. 
   
   
       34 . A biocidal article comprising a surface carrying a coating of the biocidal composition as claimed in  claim 1 .